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Stock Incentive and Employee Benefit Plans (Additional Information) (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2024 | Jul. 01, 2023 | Feb. 13, 2023 | Oct. 17, 2022 | Oct. 31, 2022 | Mar. 31, 2025 | Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Jan. 17, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of option outstanding to purchase common stock |  |  |  |  |  | 1,022,000 |  |  | 1,028,000 |  |
Options granted weighted-average grant date fair value |  |  |  |  |  |  |  |  | $ 23.49 | $ 113 |
Total intrinsic value of option exercise |  |  |  |  |  |  |  |  | $ 47,300 | $ 1,100,000 |
Stock-based compensation expenses |  |  |  |  |  | $ 3,314,000 |  | $ 3,558,000 | 15,689,000 | 14,596,000 |
Unrecognized compensation cost related to unvested stock option grants |  |  |  |  |  |  |  |  | 27,800,000 |  |
Employee benefit plan contributions by employer |  |  |  |  |  | 200,000 | $ 200,000 |  | 600,000 | $ 500,000 |
Stock issued for services, shares | 285,714 | 285,714 | 114,286 |  |  |  |  |  |  |  |
Accrued legal fees |  |  |  |  |  |  |  |  | $ 0 |  |
Weighted average period over grant |  |  |  |  |  |  |  |  | 2 years 3 months 18 days |  |
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of option outstanding to purchase common stock |  |  |  |  |  |  |  |  | 1,028 | 946 |
Stock issued for services, shares |  |  | 114,286 |  |  |  |  |  |  |  |
2022 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of option outstanding to purchase common stock |  |  |  |  |  | 1,022,353 |  |  | 1,027,977 |  |
Common stock shares reserved for future issuance |  |  |  |  |  | 703,670 |  |  | 575,220 |  |
Stock-based compensation expenses |  |  |  |  |  |  |  |  | $ 15,700,000 | $ 14,600,000 |
Semnur 2024 Stock Option Plan |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock shares reserved for future issuance |  |  |  |  |  | 40,000,000 |  |  | 40,000,000 |  |
2023 Inducement Plan |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  |  |  |  |  |  |  | 40,000
Stock-based compensation expenses |  |  |  |  |  | $ 3,300,000 |  | 3,600,000 |  |  |
Unrecognized compensation cost related to unvested stock option grants |  |  |  |  |  | $ 24,500,000 |  |  |  |  |
Weighted average period over grant |  |  |  |  |  | 2 years 1 month 6 days |  |  |  |  |
2023 Inducement Plan | Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares available for grant |  |  |  |  |  |  |  |  |  |  | 40,000
2022 Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase price of the common stock percentage |  |  |  | 85.00% | 85.00% |  |  |  |  |  |
Common stock shares reserved for future issuance |  |  |  |  |  | 127,902 |  |  | 82,164 |  |
Stock-based compensation expenses |  |  |  |  |  | $ 50,200 |  | $ 58,000 | $ 242,800 | $ 21,000 |
Shares issued under ESPP, shares |  |  |  |  |  |  |  |  | 9,551 | 9,551 |
2022 Employee Stock Purchase Plan | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock shares reserved for future issuance |  |  |  |  |  | 170,573 |  |  | 127,902 |  |

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